28 lines
973 B
Rust
28 lines
973 B
Rust
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import codemap::span;
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import ext::base::ext_ctxt;
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import ast::tt_delim;
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import parse::lexer::{new_tt_reader, reader};
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import parse::parser::{parser, SOURCE_FILE};
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import parse::common::parser_common;
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fn expand_trace_macros(cx: ext_ctxt, sp: span,
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tt: ~[ast::token_tree]) -> base::mac_result
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{
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let sess = cx.parse_sess();
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let cfg = cx.cfg();
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let tt_rdr = new_tt_reader(cx.parse_sess().span_diagnostic,
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cx.parse_sess().interner, none, tt);
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let rdr = tt_rdr as reader;
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let rust_parser = parser(sess, cfg, rdr.dup(), SOURCE_FILE);
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let arg = rust_parser.parse_ident();
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match arg {
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@~"true" => cx.set_trace_macros(true),
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@~"false" => cx.set_trace_macros(false),
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_ => cx.span_fatal(sp, ~"trace_macros! only accepts `true` or `false`")
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}
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let rust_parser = parser(sess, cfg, rdr.dup(), SOURCE_FILE);
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let result = rust_parser.parse_expr();
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base::mr_expr(result)
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}
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